De Corpore  

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-'''{{PAGENAME}}'''+'''''De Corpore''''' (On the Body) is a 1655 book by [[Thomas Hobbes]]. As its full Latin title ''Elementorum philosophiae sectio prima De corpore'' implies, it was part of a larger work, conceived as a trilogy. ''[[De Cive]]'' had already appeared, while ''[[De Homine]]'' would be published in 1658. Hobbes had in fact been drafting ''De Corpore'' for at least a decade before its appearance, putting it aside for other matters.
-====Hobbes' "Table of Absurdity" ====+
-[[Thomas Hobbes]] distinguished absurdity from errors, including basic linguistic errors as when a word is simply used to refer to something which does not have that name. According to Martinich: "What Hobbes is worried about is absurdity. Only human beings can embrace an absurdity, because only human beings have language, and philosophers are more susceptible to it than others". Hobbes wrote that "words whereby we conceive nothing but the sound, are those we call absurd, insignificant, and nonsense. And therefore if a man should talk to me of a round quadrangle; or, accidents of bread in cheese; or, immaterial substances; or of a free subject; a free will; or any free, but free from being hindered by opposition, I should not say he were in an error, but that his words were without meaning, that is to say, absurd". He distinguished seven types of absurdity. Below is the summary of Martinich, based on what he describes as Hobbes' "mature account" found in ''"[[De Corpore]]"'' 5., which all use examples that could be found in Aristotelian or scholastic philosophy, and all reflect "Hobbes' commitment to the new science of [[Galileo]] and [[William Harvey|Harvey]]". This is known as "Hobbes' Table of Absurdity".+
-#"Combining the name of a body with the name of an accident." For example, "existence is a being" or, "a being is existence". These absurdities are typical of [[scholastic philosophy]] according to Hobbes.+
-#"Combining the name of a body with the name of a phantasm." For example, "a ghost is a body".+
-#"Combining the name of a body with the name of a name." For example, "a universal is a thing".+
-#"Combining the name of an accident with the name of a phantasm." For example, "colour appears to a perceiver".+
-#"Combining the name of an accident with the name of a name." For example, "a definition is the [[essence]] of a thing".+
-#"Combining the name of a phantasm with the name of a name." For example, "the idea of a man is a universal".+
-#"Combining the name of a thing with the name of a speech act." For example, "some entities are beings ''per se''".+
-According to Martinich, [[Gilbert Ryle]] discussed the types of problem Hobbes refers to as absurdities under the term "[[category error]]".+Although the chosen title would suggest a work of [[natural philosophy]], ''De Corpore'' is largely devoted to foundational matters. It consists of four sections. Part I covers [[logic]]. Part II and Part III concern “abstract bodies”: the second part is a repertoire of scientific concepts, and the third of [[geometry]]. The Chapters 16 to 20 of Part III are in fact devoted to [[mathematics]] generally, in a reductive way, and proved controversial. They proposed a [[kinematic]] foundation for geometry, which Hobbes wished to equate with mathematics; geometry itself, that is, is a “science of motion”. Hobbes here adopts ideas from [[Galileo]] and [[Cavalieri]]. The inclusion of a claimed solution for [[squaring the circle]], an apparent afterthought rather than a systematic development, and largely retracted by Hobbes himself, led to an extended pamphlet war. It is in Part IV, on natural phenomena, that there is discussion of [[physics]] as such.
 + 
 +==See also==
 +*[[Hobbes-Wallis controversy]]
-Although common usage now considers "absurdity" to be synonymous with "[[ridiculousness]]", Hobbes discussed the two concepts as different, in that absurdity is viewed as having to do with [[invalid]] reasoning, while ridiculousness has to do with [[laughter]], [[superior (hierarchy)|superiority]], and [[deformity]]. 
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De Corpore (On the Body) is a 1655 book by Thomas Hobbes. As its full Latin title Elementorum philosophiae sectio prima De corpore implies, it was part of a larger work, conceived as a trilogy. De Cive had already appeared, while De Homine would be published in 1658. Hobbes had in fact been drafting De Corpore for at least a decade before its appearance, putting it aside for other matters.

Although the chosen title would suggest a work of natural philosophy, De Corpore is largely devoted to foundational matters. It consists of four sections. Part I covers logic. Part II and Part III concern “abstract bodies”: the second part is a repertoire of scientific concepts, and the third of geometry. The Chapters 16 to 20 of Part III are in fact devoted to mathematics generally, in a reductive way, and proved controversial. They proposed a kinematic foundation for geometry, which Hobbes wished to equate with mathematics; geometry itself, that is, is a “science of motion”. Hobbes here adopts ideas from Galileo and Cavalieri. The inclusion of a claimed solution for squaring the circle, an apparent afterthought rather than a systematic development, and largely retracted by Hobbes himself, led to an extended pamphlet war. It is in Part IV, on natural phenomena, that there is discussion of physics as such.

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